The slang word / phrase / acronym Eiffel Tower means. during sex between three people, with one person on hands and knees, being. the eiffel towersex The Eiffel Tower is a building in Paris, France. Duh. "I pray my dick get big as The Eiffel Tower / so I can fuck the world for 72 hours! The "Eiffel Tower" is a sexual act in which a person on all fours is taken from both ends by two upright gentlemen who high five in the middle.